This is my favorite. I think letting the onion & sugar set makes it extra tasty.
Dice a medium onion and add 1 cup sugar
Let set for 30 minutes
1 cup veg. Oil
½ cup cider vinegar
1/3 cup mayo
1 tsp. Salt
½ tsp. Celery seed
Shake in a jar and pour over 2-3 pkgs cole slaw & onion/sugar.
Mix and let set in fridge overnite or a few hrs. Mix a couple of times before serving.